Carburetor



Patented June 17, 1930 UNITED STATES (P ATENT OFFICE CHARLES B. JAI-INKE, OF BELOIT, WISCONSIN, ,ABVSIGNOR TO FAIRBANXS, MORSE `& C0.,

OF CHICAGO, ILLINOIS, .A CORPORATIN 0F ILLINOIS CARBURETOR Application inea october 9, .1924, serial no. 742,632.

My invention relates to improvements in fuel mixers for internal combustion engines.

The object of my invention is to provide a fuel mixer which is simple to manufacture and easily controlled.

Though my inventio-n consists largely in the construction and arrangement of parts hereinafter described and particularlypointed out in the claims, yet I do not limit my invention to the precise form or construction of parts shown or the several parts thereof, inasmuch as various alterations may be made without changing the scope of my invention.

In the drawings Fig. 1 is an elevational view of an approved form of my invention; Fig. 2 is an end View, partially in section to show a preferable means of introducing the fuel nozzle; Fig. 8 is a plan View; Fig. l is a sectional View showing a preferable form of valve entrance which may be used; and Fig. 5 is a sectional fragment of a preferred form of damper cap.

Referring by numerals to the drawings, passage 7 in member 6 is preferably restricted at 8 to form a Venturi passage and is adapted at 9 to be connected to the intake port or opening 21 of an internal combustion engine. A fuel nozzle 10, of any approved form, is placed in this passage, preferably at the restricted portion 8, and its axis is preferably substantially at right angles to the axis of the passage 7. A conduit 11 is adapted to be connected to a source of fuel supply 22 by any suitable means, such as, for example, the threaded member 12. Some means may be used to prevent receding of the column of fuel from the nozzle 10 between suction strokes, for example the ball valve 13. Over the inlet 14 is preferably placed a damper cap 15, which may be attached by some means, such as the bolt 16, nut 17, and spring 18, so that the damper may be rotated about its axis and will stay placed in any position. This damper 15 has grooves or openings 19 cut into its surface in such a manner that by turning the damper 15 the inlet may be opened any desired quantity or may be shut olf entirely. Some means, such as handle 20 may be provided to facilitate the positioning of the damper. I prefer to Vthe axis of the passage,

"locate the `mixer below the cylinder inlet ort as shown where conditions ermit. a i l v The obvious advantage of an arrangement of Ythis sort, using a curved or goose-neck member` 6, is that the lowest portion ofpas-Y sage 7 constitutes a sump below the inlet port. This result is obtained without any cast-in pockets or auxiliary parts. Fuel remaining in the engine and mixer, after stopping, condenses and collects in this sump,` which besides conserving fuel, materially aids in starting the engine.

The described example is a fuel mixer which is economical of fuel, simple in construction, and which can be manufactured at low cost. Such a mixer is particularly adapted for use on four cycle engines of the hit-and-miss type.

I claim:

1. A fuel mixer for an engine of the hitand-miss type, comprising in combination, a curved body-member having a curved Venturi passage therethrough, said member conforming substantially, in shape, with said Venturi passage and being substantially circular in cross section, said member having an air-inlet opening at one end thereof, an angularly adjustable damper abutting the inlet end of said body member and adapted to permit variation of the area of said air inlet opening, a pivot member for the damper, carried by a side wall of the body member, a spring and a retaining nut for the adjustable frictional retention of saidY damper, located outside of said body por-- tion; a fuel nozzle of non-adjustable type projecting into the most restricted portion of said Venturi passage, and transversely to and a fuel nozzle support, detachably mounted on the body member, and arranged to permit ready access to said nozzle.

2. A fuel mixer adapted for an engine of the hit-and-miss type, comprising in combination, a body portion having a substantially U shaped Venturi passage therethrough, said passage conforming substantially in shape, with said body portion, both heilig substantially circular in transverse crosssection; said body portion being so disposed:

with respect to the engine that the lowest part of said passage is directly below an inlet port of the engine; said body portion having an air inlet opening at one end thereof, an angularly adjustable damper abutting the inlet end of the body portion and adapted for variation of the air inlet area, a pivot for the damper carried by a side Wall of the body portion, a spring and a retaining nut, for the frictional retention of said damper, located outside of said body portion, a fuel-v nozzle of non-adjustable type projecting substantially to the center of the most restricted portion of said Venturi passage and at substantially a right angle to the axis of the passage; a fuel nozzle support, detachably mounted on the body member, and arranged to permit ready access to said nozzle, said nozzle being in direct connection With 0 a fuel supply source.

CHARLES B. JAHNKE. 

